LCD panel driving method, driver circuit and LCD device

ABSTRACT

A driving method for liquid crystal display (LCD) panel includes the following steps: A. sending feedback signals to a monitoring module before timing control modules (T-CONs) sends driving signals to drive display of the LCD panel; B. generating control signals when the monitoring module receives the feedback signal of each of the T-CONs, and then simultaneously sending the control signals to each of the T-CONs; C. sending a driving signal to drive display of the LCD panel when each of the T-CONs receives the control signal.

TECHNICAL FIELD

The present disclosure relates to the field of liquid crystal displays(LCDs), and more particularly to an LCD panel driving method, a drivercircuit, and an LCD device.

BACKGROUND

As shown in FIG. 1, for an ordinary liquid crystal display (LCD) panelhaving a low resolution (suppose the panel resolution is 1366×768), aninput signal is sent to a timing control module (T-CON) 2 by an inputsignal connector 1 of a printed circuit board (PCB) 3, and the T-CONprovides a distinguishable data signal to a source driver 4, andprovides a timing control signal to the source driver 4 and a gatedriver 5. For a high-level display device having a high resolution (theresolution of the display panel is 4K×2K or higher), because of a largenumber of data, a data transmission speed of the source driver and theT-CON is limited, usually more than twice the number of the sourcedrivers, the gate drivers and the T-CONs (compared with the number ofthe source drivers, the gate drivers and the T-CONs shown in FIG. 1) areneeded. When the number of the T-CONs is more than one, usually onefield programmable gate array (FPGA) is needed to comprehensivelyarrange the data and control signals of a plurality of T-CONs. Supposethe LCD panel is divided into four areas to control the panel (as shownin FIG. 2A and FIG. 2B), four T-CONs are needed to control the data andthe control signals of the four areas of the LCD panel (as shown in FIG.3), respectively. When the LCD panel is controlled by a plurality of theareas, there is a certain delay in the data and control signalstransmitted from different T-CONs to all of the areas of the LCD panel,which makes an asynchronous of display images of different areas andabnormal power-on display.

SUMMARY

In view of the above-described problems, the aim of the presentdisclosure is to provide a liquid crystal display (LCD) panel drivingmethod, a driver circuit, and an LCD device capable of solving theproblem of abnormal power-on display.

The aim of the present disclosure is achieved by the following technicalscheme.

A driving method for an LCD panel comprising a plurality of timingcontrol modules (T-CONs) comprises:

A. sending a feedback signal to a monitoring module after each of theT-CONs receives a data information required by power-on of acorresponding control area of the LCD panel;

B. generating control signals when the monitoring module receives thefeedback signals of each of the T-CONs, and then simultaneously sendingthe control signals to each of the T-CONs;

C. sending a driving signal to drive display of the LCD panel when eachof the T-CONs receives the control signal.

Furthermore, the data information required by power-on is stored inmemory modules. In the step A, each of the T-CONs reads and obtains thedata information from the memory modules, then sends the feedbacksignal. This is a specific feedback signal generation mechanism. Becauseeach of the T-CONs sends the feedback signal after each of the T-CONsobtains the data information, when the control signal is fed back, eachof the T-CONs is already stored with the data information, which avoidsthat no data information is sent when the control information is fedback is avoided, and increases the display reliability.

Furthermore, in the step B, a delay time that satisfies the monitoringmodule to receive all the feedback signals is preset in advance, themonitoring module starts to time when the monitoring module receives afirst feedback signal, and the monitoring module sends the controlsignals when the time reaches the delay time. The delay time can begenerated via experimental data so long as all of the feedback signalscan be sent to the monitoring module within the delay time. Thus, themonitoring module can delay output as long as the monitoring modulereceives the feedback signals. The technical scheme is simple, and whichreduces design cost.

A driver circuit for an LCD panel comprising a plurality of T-CONscomprises at least two T-CONs and a monitoring module; each of theT-CONs comprises a feedback unit and a receiving unit.

the feedback unit of each of the T-CONs sends a feedback signal to themonitoring module when each of the T-CONs receives the data informationrequired by power-on of a corresponding control area of the LCD panel,the monitoring module generates control signals when the monitoringmodule receives the feedback signal of each of the T-CONs, and thensimultaneously sends the control signals to each of the T-CONs, and eachof the T-CONs sends driving signal to drive display of the LCD panelwhen the receiving unit of each of the T-CONs receives the controlsignal.

Furthermore, the monitoring module is configured with a timing module,and the timing module is stored with a delay that satisfies themonitoring module to receive all of the feedback signals, the monitoringmodule starts to time when the monitoring module receives a firstfeedback signal; and the monitoring module sends the control signalswhen the time reaches the delay time. The delay time can be generatedvia experimental data so long as all of the feedback signals can be sentto the monitoring module within the delay time. Thus, the monitoringmodule can delay output as long as the monitoring module receives thefeedback signals. The technical scheme is simple, which reduces designcost.

Furthermore, the driver circuit for an LCD panel further comprisesmemory modules that stores the data information required for power-on,and the feedback unit send the feedback signal after each of the T-CONsreads the data information from the corresponding memory modules. Thisis a specific feedback signal generation mechanism. Because each of theT-CONs sends the feedback signals after each of the T-CONs obtains thedata information, when the control signals are fed back, the T-CONs arealready stored with the data information, which avoids no datainformation is sent when the control signal is fed hack in each of theT-CONs, and increases display reliability.

Furthermore, each of the T-CONs corresponds to one memory module, andthe T-CONs are in one-to-one correspondence with the memory modules.This is a specific memory module structure. Because the T-CONs are inone-to-one correspondence with the memory modules, if one memory modulefails, reliable operation of rest of the memory modules is not affected,which increases circuit reliability.

Furthermore, the memory module is configured with at least two memoryunits, each of the memory units is stored with data information forpower-on display of one T-CON, and the T-CONs are in one-to-onecorrespondence with the memory units. The technical scheme can reducethe number of the memory modules and hardware cost is reduced.

Furthermore, the feedback unit sends the feedback signal after each ofthe T-CONs reads data information. The monitoring module is configuredwith a timing module, and the timing module is stored with a delay timethat satisfies the monitoring module to receive all the feedbacksignals; the monitoring module comprises a field programmable gate array(FPGA), the feedback signals of each of the T-CONs is sent to the FPGA,and the FPGA starts to time when the FPGA receives a first feedbacksignal; the FPGA sends the control signal when the time reaches thedelay time. The memory module is an electrically erasable programmableread-only memory (EEPROM). This is a specific driver circuit.

An LCD device comprises a driver circuit for an LCD panel of the presentdisclosure.

The inventor finds by research that the T-CONs read timing datainformation and the like required for power-on and then feed back thedata information to a field programmable gate array (FPGA), and the FPGAsends corresponding display data to the T-CONs. Because during thepower-on, each of the T-CONs may asynchronously read the datainformation required for power-on, and even may unsuccessfully read,which causes the data information to be repeatedly read and read at areduced speed, thus, the time that the FPGA sends the display data toall of the T-CONs may be different, and the display time of the displayareas corresponding to all the T-CONs are different, resulting in anabnormal power-on display. In the present disclosure, because each ofthe T-CONs comprises a feedback unit and a receiving unit, the feedbackunit sends a feedback signal to the monitoring module before the T-CONsends a driving signal to drive the display of the LCD panel, themonitoring module simultaneously sends control signals to each of theT-CONs when the monitoring module receives the feedback signals from allof the T-CONs, and the T-CON sends driving signals to drive the displayof the LCD panel after the receiving unit receives the control signals.Thus, in the present disclosure, the time that each of the T-CONsreceives the control signal are the same, thereby ensuring that the timethat each of the T-CONs outputs the driving signal are the same. Thus,the display area of the LCD panel corresponding to each of the T-CONscan display synchronously, which solves abnormal display such as imagedisplay, color deviation, color distortion, and the like because of timeasynchrony in the prior art.

BRIEF DESCRIPTION OF FIGURES

FIG. 1 is a schematic diagram of a typical high-level display device inthe prior art;

FIG. 2A is one schematic diagram of a subarea display of a panel in theprior art;

FIG. 2B is another schematic diagram of a subarea display of a panel inthe prior art;

FIG. 3 is a schematic diagram of a subarea control of a panel in theprior art;

FIG. 4 is a schematic diagram of a driving method for a liquid crystaldisplay (LCD) panel of an example of the present disclosure;

FIG. 5 is a schematic diagram of a driver circuit for an LCD panel of anexample of the present disclosure;

FIG. 6 is a schematic diagram of sending feedback signals of an exampleof the present disclosure;

FIG. 7 is a schematic diagram of sending feedback signals of an exampleof the present disclosure.

DETAILED DESCRIPTION

The present disclosure provides a driving method for a liquid crystaldisplay (LCD) panel, comprising:

A. sending a feedback signal to a monitoring module after a timingcontrol module (T-CON) receives data information required by power-on ofa corresponding control area of the LCD panel;

B. generating control signals when the monitoring module receives thefeedback signals of all of the T-CONs, and simultaneously sending thecontrol signals to all of the T-CONs;

C. sending driving signals to drive display of the LCD panel when all ofthe T-CONs receive the control signals.

The inventor finds by research that the T-CONs read timing datainformation and the like required for power-on and then feed back thedata information to a field programmable gate array (FPGA), and the FPGAsends corresponding display data to the T-CONs. Because during thepower-on, each of the T-CONs may asynchronously read the datainformation required for power-on, and even may unsuccessfully read,which causes the data information to be repeatedly read and read at areduced speed, thus, the time that the FPGA sends the display data toall of the T-CONs may be different, and the display time of the displayareas corresponding to all the T-CONs are different, resulting in anabnormal power-on display. In the present disclosure, because each ofthe T-CONs comprises a feedback unit and a receiving unit, the feedbackunit sends a feedback signal to the monitoring module before the T-CONsends a driving signal to drive the display of the LCD panel, themonitoring module simultaneously sends control signals to each of theT-CONs when the monitoring module receives the feedback signals from allof the T-CONs, and the T-CON sends driving signals to drive the displayof the LCD panel after the receiving unit receives the control signals.Thus, in the present disclosure, the time that each of the T-CONsreceives the control signal are the same, thereby ensuring that the timethat each of the T-CONs outputs the driving signal are the same. Thus,the display area of the LCD panel corresponding to each of the T-CONscan display synchronously, which solves abnormal display such as imagedisplay, color deviation, color distortion, and the like because of timeasynchrony in the prior art.

The present disclosure will further be described in detail in accordancewith the figures and the examples.

As shown in FIG. 4, the present disclosure provides a driving method foran LCD panel, comprising:

A. sending a feedback signal to a monitoring module after a timingcontrol module (T-CON) receives data information required by power-on ofa corresponding control area of the LCD panel. Each of the T-CONs readsand receives the data information from a memory module;

B. presetting a delay time that satisfies the monitoring module toreceive all of the feedback signals in advance, starting to time whenthe monitoring module receives the first feedback signals, and themonitoring module sends control signals to each of the T-CONs when thetime reaches the delay time. The delay time is generated viaexperimental data so long as all of the feedback signals can be sent tothe monitoring module within the delay time;

C. sending driving signals to drive display of the LCD panel when theT-CONs receive the control signals.

In step A, because each of the T-CONs sends the feedback signal aftereach of the T-CONs obtains the data information, when the control signalis fed back, each of the T-CONs is already stored with the datainformation, which avoids no data information is sent when the controlsignal is fed back in each of the T-CONs, and increases displayreliability.

In step B, the monitoring module can delay output as long as themonitoring module receives the feedback signals. The technical scheme issimple, which reduces design cost.

As shown in FIG. 5, the present disclosure further provides an LCDdevice that comprises a driver circuit for an LCD panel. The drivercircuit comprises at least two timing control modules. Each of theT-CONs comprises a feedback unit and a receiving unit. The drivercircuit further comprises a monitoring module.

The feedback unit sends a feedback signal to the monitoring modulebefore each of the T-CONs sends a driving signal that drives display ofthe LCD panel, the monitoring module simultaneously sends controlsignals to each of the T-CONs after the monitoring module receives allthe feedback signals, and each of the T-CONs sends the driving signal todrive the display of the LCD panel after the receiving unit receives thecontrol signal.

As shown in FIG. 6 and FIG. 7, the driver circuit for an LCD panelfurther comprises memory modules stored with data information requiredby power-on display of the LCD panel, and the feedback unit sends thefeedback signal (cs1/2/3/4) after each of the T-CONs reads the datainformation from each of the memory modules. The monitoring nodule isconfigured with a timing module, and the timing module is stored with adelay time that satisfies the monitoring module to receive all of thefeedback signals. The monitoring module comprises a field programmablegate array (FPGA), the feedback signal of each of the T-CON is sent tothe FPGA, the FPGA starts to time when the monitoring module receivesthe first feedback signal, and the monitoring module sends the controlsignal cs5 when the time reaches the delay time. The memory modulecomprises the electrically erasable programmable read-only memory(EEPROM).

The example is a specific feedback signal generation mechanism. Becauseeach of the T-CONs sends the feedback signals after each of the T-CONsobtains the data information, when the control signal is fed back, eachof the T-CONs is already stored with the data information, which avoidsthat no data information is sent when the control signal is fed back,and increases the display reliability.

The delay time is generated via experimental data so long as all of thefeedback signals can be sent to the monitoring module within the delaytime. Thus, the monitoring nodule can delay output as long as themonitoring module receives feedback signals. The technical scheme issimple, which reduces design cost.

In the present disclosure, because each of the T-CONs corresponds to amemory module, namely the T-CONs are in one-to-one correspondence withthe memory modules, if one memory module fails, reliable operation ofrest of the memory modules is not affected, which increases circuitreliability. Optionally, one memory module can be configured with atleast two memory units as well. Each of the memory units is stored withdata information required by power-on display of one T-CON, namely theT-CONs are in one-to-one correspondence with the memory modules. Thus,the number of memory modules and hardware cost is reduced.

The invention is described in detail in accordance with the abovecontents with the specific preferred examples. However, this presentdisclosure is not limited to the specific examples. For the ordinarytechnical personnel of the technical field, of the present disclosure,on the premise of keeping the conception of the present disclosure, thetechnical personnel can also make simple deductions or replacements, andall of which should be considered to belong to the protection scope ofthe present disclosure.

The invention claimed is:
 1. A driving method for a liquid crystaldisplay (LCD) panel comprising a plurality of timing control modules(T-CONs), comprising: A. sending a feedback signal to a monitoringmodule after each of the T-CONs receives data information required bypower-on of a corresponding control area of the LCD panel; B. generatingcontrol signals when the monitoring module receives the feedback signalof each of the T-CONs, and then simultaneously sending the controlsignals to each of the T-CONs; C. sending a driving signal to drivedisplay of the LCD panel when each of the T-CONs receives the controlsignal.
 2. The driving method for the LCD panel comprising the pluralityof the T-CONs of claim 1, wherein the data information required bypower-on is stored in the memory modules; in step A, each of the T-CONsreads and obtains the data information from the memory modules, thensends the feedback signal.
 3. The driving method for the LCD) panelcomprising the plurality of the T-CONs of claim 1, wherein in the stepB, a delay time that satisfies the monitoring module to receive all ofthe feedback signals is preset in advance; the monitoring module startsto time when the monitoring module receives a first feedback signal; andthe monitoring module sends the control signals when the time reachesthe delay time.
 4. A driver circuit for a liquid crystal display (LCD)panel comprising a plurality of timing control modules (T-CONs),comprising: at least two T-CONs, wherein each of the T-CONs comprises afeedback unit and a receiving unit; and a monitoring module; wherein thefeedback unit of each of the T-CONs sends a feedback signal to themonitoring module when each of the T-CONs receives the data informationrequired by power-on of a corresponding control area of the LCD panel,the monitoring module generates control signals when the monitoringmodule receives the feedback signal of each of the T-CONs, and thensimultaneously sends the control signals to each of the T-CONs, and eachof the T-CONs sends driving signal to drive display of the LCD panelwhen the receiving unit of each of the T-CONs receives the controlsignal.
 5. The driver circuit for the LCD panel comprising the pluralityof the T-CONs of claim 4, wherein the monitoring module is configuredwith a timing module, and the timing module is stored with a delay timethat satisfies the monitoring module to receive all of the feedbacksignals; the monitoring module starts to time when the monitoring modulereceives a first feedback signal; and the monitoring module sends thecontrol signals when the time reaches the delay time.
 6. The drivercircuit for the LCD panel comprising the plurality of the T-CONs ofclaim 4, wherein the driver circuit further comprises memory modulesthat store the data information required for power-on, and the feedbackunit sends the feedback signal after each of the T-CONs reads the datainformation from the corresponding memory module.
 7. The driver circuitfor the LCD panel comprising the plurality of the T-CONs of claim 6,wherein each of the T-CONs corresponds to a memory module, and theT-CONs are in one-to-one correspondence with the memory modules.
 8. Thedriver circuit for the LCD panel comprising the plurality of the T-CONsof claim 6, wherein the memory module is configured with at least twomemory units; each of the memory units is stored with the datainformation of one T-CON, and the T-CONs are in one-to-onecorrespondence with the memory units.
 9. The driver circuit for the LCDpanel comprising the plurality of the T-CONs of claim 4, wherein thedriver circuit further comprises memory modules that store the datainformation required for power-on; the feedback unit sends the feedbacksignal after each of the T-CONs reads the data information from thecorresponding memory modules; the monitoring module is configured with atiming module, and the timing module is stored with a delay time thatsatisfies the monitoring module to receive all of the feedback signals;the monitoring module comprises a field programmable gate array (FPGA),the feedback signal of each of the T-CONs is sent to the FPGA, the FPGAstarts to time when the FPGA receives a first feedback signal; the FPGAsends the control signal when the time reaches the delay time; thememory module is an electrically erasable programmable read-only memory(EEPROM).
 10. A liquid crystal display (LCD) device, comprising: adriver circuit for an LCD panel comprising a plurality of timing controlmodules (T-CONs), wherein the driver circuit comprises at least twoT-CONs and a monitoring module, and each of the T-CONs comprises afeedback unit and a receiving unit; wherein the feedback unit of each ofthe T-CONs sends a feedback signal to the monitoring module when each ofthe T-CONs receives the data information required by power-on of acorresponding control area of the LCD panel, the monitoring modulegenerates control signals when the monitoring module receives thefeedback signal of each of the T-CONs, and sends the control signals toeach of the T-CONs, and each of the T-CONs sends driving signal to drivedisplay of the LCD panel when the receiving unit of each of the T-CONsreceives the control signals.
 11. The LCD device of claim 10, whereinthe monitoring module is configured with a timing module, the timingmodule is stored with a delay time that satisfies the monitoring moduleto receive all of the feedback signals; the monitoring module starts totime when the monitoring module receives a first feedback signal, andthe monitoring module sends the control signals when the time reachesthe delay time.
 12. The LCD device of claim 10, wherein the drivercircuit further comprises memory modules that store the data informationrequired for power-on, and the feedback unit sends the feedback signalsafter the each of the T-CONs reads the data information from thecorresponding memory module.
 13. The LCD device of claim 12, whereineach of the T-CONs corresponds to a memory module, and the T-CONs are inone-to-one correspondence with the memory modules.
 14. The LCD device ofclaim 12, wherein the memory module is configured with at least twomemory units; each of the memory units is stored with the datainformation of one T-CON, and the T-CONs are in one-to-onecorrespondence with the memory units.
 15. The LCD device of claim 10,wherein the driver circuit further comprises memory modules that storethe data information required for power-on, and the feedback unit sendsthe feedback signals after each of the T-CONs reads the data informationfrom the corresponding memory modules; the monitoring module isconfigured with a timing module, and the timing module is stored with adelay time that satisfies the monitoring module to receive all the offeedback signals; the monitoring module comprises a field programmablegate array (FPGA), the feedback signal of each of the T-CONs is sent tothe FPGA, the FPGA starts to time when the FPGA receives a firstfeedback signal; the FPGA sends the control signal when the time reachesthe delay time; the memory module is an electrically erasableprogrammable read-only memory (EEPROM).